diff --git a/src/Convert/TypeOf.hs b/src/Convert/TypeOf.hs
index 912c77a..baed014 100644
--- a/src/Convert/TypeOf.hs
+++ b/src/Convert/TypeOf.hs
@@ -134,6 +134,7 @@ typeof (orig @ (Dot e x)) = do
 typeof (Cast (Right s) _) = return $ typeOfSize s
 typeof (UniOp UniSub  e  ) = typeof e
 typeof (UniOp BitNot  e  ) = typeof e
+typeof (UniOp LogNot  _  ) = return $ IntegerVector TLogic Unspecified []
 typeof (BinOp Pow     e _) = typeof e
 typeof (BinOp ShiftL  e _) = typeof e
 typeof (BinOp ShiftR  e _) = typeof e
diff --git a/test/basic/typeof.sv b/test/basic/typeof.sv
index 130d3b9..4bc267d 100644
--- a/test/basic/typeof.sv
+++ b/test/basic/typeof.sv
@@ -32,6 +32,7 @@ module top;
         type(FLAG ? x : y) c = FLAG ? x : y;
         type(!FLAG ? x : y) d = !FLAG ? x : y;
         type($clog2(x)) e = $clog2(x);
+        type(!e) f = !e;
         $display("%b %d %d", x, $left(x), $right(x));
         $display("%b %d %d", y, $left(y), $right(y));
         $display("%b %d %d", z, $left(z), $right(z));
@@ -40,6 +41,7 @@ module top;
         $display("%b %d %d", c, $left(c), $right(c));
         $display("%b %d %d", d, $left(d), $right(d));
         $display("%b %d %d", e, $left(e), $right(e));
+        $display("%b %d", f, $bits(f));
     end
 
     parameter W = 4;
diff --git a/test/basic/typeof.v b/test/basic/typeof.v
index dfada9a..b5cea6e 100644
--- a/test/basic/typeof.v
+++ b/test/basic/typeof.v
@@ -34,6 +34,7 @@ module top;
         reg [7:0] b;
         reg [3:0] c, d;
         integer e;
+        reg f;
         x = 4'b1011;
         y = x ^ 3'b111;
         z = x ^ 5'b11111;
@@ -42,6 +43,7 @@ module top;
         c = FLAG ? x : y;
         d = !FLAG ? x : y;
         e = $clog2(x);
+        f = !e;
         $display("%b %d %d", x, 4, 1);
         $display("%b %d %d", y, 3, 0);
         $display("%b %d %d", z, 4, 0);
@@ -50,6 +52,7 @@ module top;
         $display("%b %d %d", c, 3, 0);
         $display("%b %d %d", d, 3, 0);
         $display("%b %d %d", e, 31, 0);
+        $display("%b %d", f, 1);
     end
 
     parameter W = 4;